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https://issues.apache.org/jira/browse/DIRMINA-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17012726#comment-17012726
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Christoph John commented on DIRMINA-1120:
-----------------------------------------

Quote from 
http://mina.apache.org/mina-project/gen-docs/2.1.3/apidocs/org/apache/mina/core/session/IoSession.html

{quote}
Thread Safety

IoSession is thread-safe. But please note that performing more than one 
write(Object) calls at the same time will cause the 
IoFilter.filterWrite(IoFilter.NextFilter,IoSession,WriteRequest) to be executed 
simultaneously, and therefore you have to make sure the IoFilter 
implementations you're using are thread-safe, too. 
{quote}

> ProtocolCodecFilter does not support concurrent access
> ------------------------------------------------------
>
>                 Key: DIRMINA-1120
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-1120
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.1.1, 2.1.2, 2.1.3
>            Reporter: Cloudor Pu
>            Priority: Major
>
> In ProtocolCodecFilter#filterWrite method, the same writeRequest might be 
> written more than once and previous encoded message would be overwritten by 
> next ones and cause message lost problems.



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